North Atlantic Treaty Organization (Nato)

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** FILE ** In an April 15, 2012, file photo NATO soldiers run during a gun battle in Kabul, Afghanistan. The United States and its NATO allies are readying plans to pull away from the front lines in Afghanistan next year as President Barack Obama and fellow leaders try to show that the unpopular war is ending. (AP Photo/Musadeq Sadeq/file)

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A NATO soldier is poised to respond at the scene of an attack by the Taliban in Kabul, Afghanistan, on Sunday. At least two Taliban were killed and five people were wounded in the capital. There were attacks in three other cities. (Associated Press)

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Smoke rises following attacks on Sunday, April 15, 2012, by Taliban militants on three neighborhoods of Kabul, Afghanistan, that are home to government buildings, Western embassies and NATO facilities. (AP Photo/AP Video)

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Gen. John Allen (left), the top commander of U.S. and NATO forces in Afghanistan, claps with Afghan Defense Minister Gen. Abdul Rahim Wardak on April 8, 2012, in Kabul, Afghanistan, after signing an agreement document governing night raids by American troops. (Associated Press)

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**FILE** Supporters of Pakistani religious parties rally March 27, 2012, near the Parliament in Islamabad, Pakistan, against the Pakistani government allowing NATO to resume shipping supplies through the country to its troops in neighboring Afghanistan. (Associated Press)

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Navy Adm. James G. Stavridis, NATO's top military commander, says the expectation of having more than 350,000 Afghan security force members in service by summer puts the turnover ahead of schedule. (Associated Press)

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Canadian soldiers (right), part of the NATO-led International Security Assistance Force (ISAF), attend a graduation ceremony for Afghan soldiers at a military training center in Kabul, Afghanistan, on Wednesday, March 14, 2012. (AP Photo/Musadeq Sadeq)

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US soldiers — part of the NATO-led International Security Forces (ISAF) — are seen at the scene of an attack with Afghan security forces in Kandahar, south of Kabul, Afghanistan, Monday, Feb. 20, 2012. A suicide car bomber attacked the police station in southern Afghanistan's largest city on Monday, killing one police officer in the blast, officials said. (AP Photo/Allauddin Khan)

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U.S. Secretary of Defense Leon E. Panetta (left) speaks with NATO Secretary-General Anders Fogh Rasmussen during a meeting of NATO defense ministers at NATO headquarters in Brussels on Thursday, Feb. 2, 2012. (AP Photo/Virginia Mayo)

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Secretary of Defense Leon E. Panetta briefs reporters Wednesday aboard a plane en route to a NATO defense ministers meeting in Brussels. He called 2013 a critical year for the decade-old U.S. military mission in Afghanistan. (Associated Press)

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**FILE** Afghan policemen walk ahead of the U.S. soldiers with the NATO-led International Security Assistance Force (ISAF) during a foot patrol Jan. 7, 2012, in Kandahar, Afghanistan. (Associated Press)

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** FILE ** Afghan policemen walk ahead of the U.S. soldiers with the NATO-led International Security Assistance Force (ISAF) during a foot patrol in Kandahar, south of Kabul, Afghanistan, in this Jan. 7, 2012, file photo. (AP Photo/Allauddin Khan, File)

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Afghan security forces celebrate Tuesday during a ceremony transferring authority from NATO-led troops to them in an area west of Kabul. The turnover to Afghan troops and police is to be finished by 2014. (Associated Press)

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**FILE** A British military official with the NATO-led International Security Assistance Force (ISAF) adjusts his helmet Jan. 19, 2012, as a NATO helicopter lands at the Provincial Reconstruction Team compound in Lashkar Gah, Helmand province, south of Kabul, Afghanistan. (Associated Press)

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U.S. soldiers with the NATO led International Security Assistance Force (ISAF) stand guard at the scene of a suicide attack in Kandahar south of Kabul, Afghanistan, Thursday, Jan. 19, 2012. In a separate incident, a senior U.S. defense official says all six reported killed in the crash of a U.S. helicopter in Afghanistan were U.S. Marines. (AP Photo/Allauddin Khan)

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A U.S. soldier with the NATO led International Security Assistance Force (ISAF) walks Jan. 19, 2012, by a damaged vehicle at the scene of a suicide attack in Kandahar south of Kabul, Afghanistan. The attacker blew himself up at an entrance to a sprawling base for U.S. and NATO operations in southern Afghanistan, killing at least six civilians, police said. (Associated Press)